DPS help for GC Inquisitor

Hi everyone,

Now that I had a service take care of the red elder for me (MFRaiding helped me out, good service if you're looking) its time to hit the drawing board.

I suspect my DPS was one of the major issues with red elder. My question now is what support gems should I use for GC? Check out my profile for my passive tree. in my HO using flasks I can get up to about 100k DPS, I had 118k in a map once but i'm not sure how that happened.

Right now I use
GC 20%
Efficiency Support 14%
Elemental Focus
Faster Casting 20%
Increases Crit Support
Spell Echo 20%
Lvl 15 chaos damage (Covenant Body Armor)

Lvl 20 Ice Golem

Thanks to helm enchant, I run 3 Auras
Hatred
Herald of Ice
Herald of Ash

Are there other gems I should consider to beef up my DPS? Or anything else for that matter?